Investments - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Apr. 30, 2022	Jan. 31, 2022
Cash equivalents:
Amortized Cost	$ 311,142	$ 339,528	$ 204,531
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	760,500	916,988
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	50	20
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(1,085)	(2,168)
Total cash equivalents and available-for-sale marketable securities	759,465	914,840
Money market funds
Cash equivalents:
Amortized Cost	155,476	107,726
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	155,476	107,726
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	12,506	12,764
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(64)	(1)
Estimated Fair Value	12,442	12,763
Certificates of deposit
Cash equivalents:
Amortized Cost	0	3,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value	0	3,000
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	64,252	97,205
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	64,252	97,205
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	26,627	14,113
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(199)	(223)
Estimated Fair Value	26,428	13,890
Commercial paper
Cash equivalents:
Amortized Cost	121,995	142,511
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	121,995	142,511
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	180,413	241,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Estimated Fair Value	180,413	241,132
Corporate debt securities
Cash equivalents:
Amortized Cost	3,325	8,889
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(5)
Estimated Fair Value	3,327	8,884
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	195,906	289,646
Gross Unrealized Gains	48	20
Gross Unrealized Losses	(822)	(1,937)
Estimated Fair Value	$ 195,132	$ 287,729

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